To find Missy's average speed, we can use the formula:

$\text{Speed} = \frac{\text{Distance}}{\text{Time}}$

Missy rode 16 miles in 1 1/4 hours. We can convert 1 1/4 hours into a decimal:

$1 \frac{1}{4} = 1.25 \, \text{hours}$

Now, calculate the speed:

$\text{Speed} = \frac{16 \, \text{miles}}{1.25 \, \text{hours}} = 12.8 \, \text{miles per hour}$

So, Missy's average speed was 12.8 miles per hour.

Would you like more details on the steps, or do you have any questions?

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Here are 5 related questions:

1. If Missy rode for 2 hours at the same speed, how far would she travel?
2. What would her average speed be if she took 2 hours to cover the same 16 miles?
3. How long would it take Missy to cover 30 miles at her current speed?
4. What is her speed in feet per second, given 1 mile = 5280 feet?
5. If Missy increased her speed by 25%, what would her new speed be?

Tip: Always ensure units are consistent when solving speed, distance, or time problems.